What Is an MPN? A Guide to Reading the Manufacturer Part Number
The key to searching for, ordering and finding an equivalent of an electronic part correctly is a single code: the MPN. Engineers and purchasing teams work with this code dozens of times a day, but often skip over what its structure tells them. In this article we cover what an MPN is, how it's read, and why it's the most reliable search method.
What is an MPN?
The MPN (Manufacturer Part Number) is a component's unique identifier assigned by its manufacturer. For example, NE555P is the MPN of a Texas Instruments timer IC. Unlike distributor stock codes (SKUs), the MPN belongs to the company that makes the part and is the same no matter which distributor you look at; that's why it's the most reliable way to identify a part precisely.
How is an MPN structured?
Most MPNs aren't random; the manufacturer has a coding logic, and they usually consist of three parts:
- Prefix / core: indicates the part family and basic function (for example, LM358 is an op-amp family).
- Package code: shows the physical package (for example, 'P' may be DIP, 'D' SOIC). The same chip gets a different suffix in a different package.
- Temperature/grade and packaging suffixes: add the temperature range, quality grade or packaging info such as reel/tube.
That's why LM358P and LM358D can be the same chip but a different package; even a single letter changes the order.
Why does searching by MPN give the most accurate result?
Searching by product name ("555 timer") can return hundreds of similar results; an MPN, however, points to a single part. On PartAndStock, searching by MPN gathers all of that part's distributor offers, price and stock status, and equivalents on a single screen. Remember that a one-character difference means a different part — so always copy the MPN exactly, character for character.
Frequently asked questions
What's the difference between an MPN and an SKU?
The MPN is the number assigned by the manufacturer and is the same everywhere; the SKU is the distributor's own stock code and varies from distributor to distributor.
Why does the final letter in an MPN matter?
Suffixes usually indicate package, temperature grade or packaging. A wrong suffix can lead you to order a part that physically doesn't fit or has different ratings.
What do I do if I don't know the exact MPN?
You can narrow results by searching with a partial MPN or brand + product name; PartAndStock's fuzzy search surfaces the most likely parts despite spelling differences.
Conclusion
The MPN is the common language of electronics sourcing: read correctly, it prevents ordering the wrong part and cuts searching down to seconds. To see all offers and equivalents for an MPN, try a search, and when looking for alternatives use the cross-reference tool.